“…[12][13][14][15]. Intrinsic luminescence of LGBO crystals and luminescence of Ce 3 þ and Eu 3 þ impurities in these crystals have been investigated in detail for different types of excitation over a wide temperature range from 4 to 500 K. These LGBO emissions have been studied not only upon selective photoexcitation in the UV [1,4,3,16,17], vacuum UV (VUV) [18][19][20][21] and soft X-rays [22,23] energy regions, but the laboratory excitation sources of ionizing radiation as well [24][25][26]. Optical properties of LGBO crystals in the temperature range of 77-300 K were studied in Refs.…”